start-docker-sync.sh

#!/bin/bash

debug="${DEBUG:-false}"
if [[ "$1" == "-d" ]]; then debug="true"; fi

timeout="${TIMEOUT:-300}" # 5 minutes
sleep_time="${SLEEP:-1}"  # 1 second

check_docker_running() {
    docker system info >/dev/null 2>&1
}

log() {
    [[ "$debug" != "true" ]] || echo "$@"
}

current_ts() {
    date +%s
}

if check_docker_running; then
    log "Docker already running"
else
    log "Start Docker"
    open /Applications/Docker.app
    log "Wait for Docker to be started"
    start=$(current_ts)
    while ! check_docker_running; do
        now=$(current_ts)
        duration=$(( now - start ))
        log "  duration=$duration"
        if (( duration > timeout )); then
            echo "Wait for too long (${duration}s, timeout was ${timeout}s), stop here" >&2
            exit 3
        fi
        sleep "$sleep_time"
    done
    log "Docker started"
fi